zwak
New Member
Posts: 44
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Post by zwak on Jun 30, 2017 11:21:18 GMT -7
Could we get the Doctor to weigh in with his position on Tube Shields. Are the necessary! I have a Therapy head and want to know if the amp will survive without the shields!
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Post by walt on Jun 30, 2017 18:52:52 GMT -7
I haven't had mine on for around a year,I took them off cause I thought they might have been rattling,and just left them off.My amp never travels though,something to consider.
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Post by BritInvasion on Jun 30, 2017 19:15:16 GMT -7
I gigged a Maz 18 head for 7 years with them off and never had a problem. I leave them on in my combo because of the effects of gravity.
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Post by zpilot on Jun 30, 2017 20:27:48 GMT -7
Shouldn't ever be a problem for 9A tubes if the sockets are properly tensioned. It would be prudent to check the tubes periodically anyway-say once a month if the amp travels.
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Post by wraparound (Steve) on Jun 30, 2017 22:06:51 GMT -7
It will survive just fine if not better. If there is RF interference in the environment you are using the amp, they shield it. But they do trap the heat which is not ideal. Some amps are designed with them and some not. You can read 200 pages of article about this at pearl-hifi.com, but really I just don't care much personally and tend to get annoyed at tweaks that make me feel I can't play without them. I would say if you need to keep RF in check then use them, and if not don't. If you can't decide, try to figure out if Jimi would have cared or known.
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Post by DRZ on Jul 1, 2017 1:41:23 GMT -7
I gigged a Maz 18 head for 7 years with them off and never had a problem. I leave them on in my combo because of the effects of gravity. This correct, we use them just to make sure the effects of RF aren't a problem to the end user at his location. But you get better tube life, and many say tone , without them, Ken Fischer was a believer in no tube shields. Also with the new safety UL regulations they do offer protection from touching a hot tube, yes this a concern to UL, and all output tubes must be caged for this same issue. Caging output tubes is a must in all EU countries, and will probably be needed on domestic amps soon, if you have UL compliancy. Z
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Post by zpilot on Jul 1, 2017 2:29:10 GMT -7
And next they will demand placards warning not to insert your hand. Lawyers and x%#!ing bureaucrats.
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Post by doctorice on Jul 2, 2017 6:04:55 GMT -7
And next they will demand placards warning not to insert your hand. Lawyers and x%#!ing bureaucrats. Like the warnings on hot beverages
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Post by nicholas on Jul 3, 2017 13:50:56 GMT -7
And next they will demand placards warning not to insert your hand. Lawyers and x%#!ing bureaucrats. My wife says I should wear my sign around my neck...
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zwak
New Member
Posts: 44
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Post by zwak on Jul 12, 2017 13:20:12 GMT -7
I gigged a Maz 18 head for 7 years with them off and never had a problem. I leave them on in my combo because of the effects of gravity. This correct, we use them just to make sure the effects of RF aren't a problem to the end user at his location. But you get better tube life, and many say tone , without them, Ken Fischer was a believer in no tube shields. Also with the new safety UL regulations they do offer protection from touching a hot tube, yes this a concern to UL, and all output tubes must be caged for this same issue. Caging output tubes is a must in all EU countries, and will probably be needed on domestic amps soon, if you have UL compliancy. Z Thanks Doc, this is what I needed to hear!
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